Orthodontic appliance



FIG. 1 is a top-front-left perspective view of an orthodontic appliance showing my new design;

FIG. 2 is a bottom-rear-right perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right elevational view thereof;

FIG. 8 is a left elevational view thereof;

FIG. 9 is a top-front-right perspective view thereof, showing the orthodontic appliance in a first configuration;

FIG. 10 is a top-front-right perspective view thereof, showing the orthodontic appliance in a second configuration;

FIG. 11 is a top-front-right perspective view thereof, showing the orthodontic appliance in a third configuration; and,

FIG. 12 is a top-front-right perspective view thereof, showing the orthodontic appliance in a fourth configuration.

The broken lines shown in the drawings represent portions of the orthodontic appliance that form no part of the claimed design. 

CLAIM The ornamental design for an orthodontic appliance, as shown and described. 